Yes, you can transfer your TurboTax Desktop to TurboTax Online:

If you used TurboTax Desktop last year

Go to TurboTax.

If you don’t yet have a TurboTax Online account, follow the prompts to the File with complete confidence screen.

Select Create account and follow the steps to create your account.

Sign in, and on the Great to see you again! screen, select Start a new return.

Continue until arriving at How did you do your taxes last year? and select TurboTax Download/CD, then Continue.

Let’s start with last year’s return, select Choose File, and from the Open pop-up, select your 2024 file and select Open.

Now that your 2024 filename is in the Choose a .tt23 file to upload field, enter your Social Insurance number and select Continue.

Thank you for choosing TurboTax.

My question is pointing out how I can download my Tax return (*.tt5) when I am using TurboTax Deluxe Online Edition not how I may upload my previous year(s) tax returns. Therefore this response is not answering my question.

Briefly asking, how can I download my Tax return (*.tt5) onto my PC when I am using TurboTax Deluxe Online Edition?

Thank you for your answers in advance.

You cannot download a .tt25 (or .tt5) data file from TurboTax Online Canada. The .ttxx file format is exclusive to the  Desktop version of the software. TurboTax Online stores your data in the cloud and uses a different internal structure. You can only save a PDF copy using TurboTax Online.